Waste liquor aerator



Patented Mar. 2,438,342

2338342 4 WASTE LIQUOR muon Edward B. Mallory, Tenafly, N.` J.Application .September 6, 1944, Serial No. 552348' 7 Claims. (Ci. 210--UNITED' VSTATES .PATENT OFFICE' The invention relates to aerators suchas have paths of flow o! the mixed liquor at various long been used inth puriflcation oi sewage and points within the aerator. v

similar wastes by the so -cal led activated or ox- Fig. 3 is a cross'section of the aerator shown I idized sludge process, wherein the'mixedliquor in Figs. 1 and 2. r e

consisting of incoming wastes mixed with re- The invention disclosed asapplied to an aerae turned siudge, is first subjected to an aerating tortank I having elongated side walls 2 and 3, a step and then permitted tosettle out in a clarifler. bottom wall I, an end wall 5 through whichpasses The so-called spiral flow type aerators have long an influentconduit 6 for the mixed liquor to be been used for the above purposes,comprising an aerated, and an end wall 1 .through which passes elongatedtank having air diffusers running lon- 10 the offtake conduit 8 for theaerated mixed liquor. gitudinally along one side of the tank in the bot-In order to produce the above mentioned optom portion thereof, so astoproduce a spiral path positely rotating currents of liquid, I provide inof flow of the mixed liquor through the tank from the bottom portion ofthe aerator tank, near the one end to the other.. Aerators of the spiralflow side wall 2, a series of spaced. longitudinally distype howeverhave been relatively ineflicient since' posed air difluser members 9,which are staggered they tend to create a, central core within thespiral in position with respect to a similar series of path which isrelatively inactive in respect to spaced diffuser members n disposed inthe botmixing and aeration of the tank "contents, and 'tom portion ofthe tank near the side wall 3. Prefwhich central core forms ashort-circuited path erably' these air diflusers 9 and o are in the 7through whichasubstantial portion of the liquors form of separateinverted T-shaped perforated may flow without partaking substantially ofthe pipes, as shown, to aflord convenient separate respiral movement.moval for inspection and cleaning without shut- The present inventionaims primarily to imting down the tank.

prove the eiflciency of aerators of the above type In the zones of thetank opposite the air dify ly breaking up the above mentioned cen- 5fusers 9, rotating currents of iiquid win be set up tral core andcompelhng the contents to m as indicated by the Vectors II in Fig. 2. In

through a longer and more active path whereby the nes opposite the airdifiuser members u, op-

The invention is applicable either to new installaas indicated by theVectors IZ inFig. 2. In the tOhS the modification Of art spital zonesbetween the Vectors II and !2, vortical flow aerators to secure markedlyincreased effle t of uq a be set up as indicated by ciency. v thevectors!3 in Fig. 2, these vortices extending I have found thatvi the directionOfrotatioh Of out radially from the central longitudinal axis of thehquid column be TeVerSed at frequent intel" the tank and usuallycontinuously shifting their Vals i its passage through the %faton Whatpositions, and producing violent mixing and agimight be called aSheafing action iS Set up in the tation m these regions of the tank. Thedistance currents in such manner as to create an excessive abo'ut 15 ft"but the spacmg is not critical turbuience and shifting vortices in theseregions. While the invention has been dscosed as which break up theabove mentioned central core 40 fled out by theiabove described specificf rm Of and prevent short-circuiting through the central apparatus, itshould be understood that many portion of the aerator. The contents ofthe tank changes may d t er without departing which may constitute thecentral cores within the from the invention m its bmader aspectsrespective oppositely rotating liquid currents are I claim:

thereby violently agitatedan'd mixed with t per 1. In a wastepuriflcation process, the method 'ripheral regions of the rotatingCurrents, the of %rating waste contaimngnquors comp-smg %muon beingthereby greafly enhanced' a incoming wastes in admixture with so-calledre- Funnel' Objects and advantages of the mVen' turned sludgewhichincludes passing the liquors tion will he in part obvious and inpartspeciflcally progresswely through successwe zones Spaced referred to inthe description hereinafter eonhorzontauy along a aeratmg tank, m mtained which discloses the* invention as applied oxygen containing gasinto one tt portion of to a simple form of spiral w aeratol'- The onesuch zone of the tank on one side thereoi to' closure however should beconsidered merely as set up a rotary column of nquors t t oneillustrative of the inventionin its broader aspects. direction usubstantiany horizontal xl In the drawing&- and also injecting oxygencontaining gas into an Fig. 1 is a central vertical longitudinal sectionadjac nt tt portion t an adjacent zone the taken through an a r t r ppto operate in tank at points spaced tra'nsversey and also longiaccor ancwith the i i tudinally of the tankwith respectto said first Fig. 2 is aplan view of the aerator shown in mntioned bottom portion, to set up arotary F a d h ri c rt V r o indicate the 'column of liquors rotating inthe 'other direction effective m in and r i m y be obtainedpositelyrotating currents of liquid will be set up regions between the oppositeymtating mund between 'adjacent diflusers may be of the order' of &488342tica currents of liquor between the-opposltely' injecting means. v 5.Apparatus of the character described for the aeration of wastecontaining liquors comprisng ing oppositely as aforesaid.

7. Apparatus of the The following character described for the g a seriesofing members lo- EDWARD B. MALLORY.

REFERENCES crrm file of ths patent:

Number Number Name Hirzel Imhoff et al. Piatt Stich Downes Downes et alreferences are of record in the NITED' STA'I'ES PATENTS Date Aug. 8,1899 Mar. 17, 1931 Nov. 28, 1933 r May 22, 1934 Dec. 25, 1934 Mar. 19,1935 Currie Jan. 14, 1936 Jones Nordell Durdin, Jr. FOREIGN" PA'I'ENTSCountry Germany May 19, 19.36 Jan. 17, 1939 1 Nov. 12, 1940 Date Apr. 2,1908

